CN101499963B - Method and apparatus for downlink transmission - Google Patents
Method and apparatus for downlink transmission Download PDFInfo
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- CN101499963B CN101499963B CN2008100575747A CN200810057574A CN101499963B CN 101499963 B CN101499963 B CN 101499963B CN 2008100575747 A CN2008100575747 A CN 2008100575747A CN 200810057574 A CN200810057574 A CN 200810057574A CN 101499963 B CN101499963 B CN 101499963B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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Abstract
The invention discloses a method of downlink transmission, comprising the following steps: a DwPTS bearer downlink control signaling, a P-SCH channel, downlink data and a downlink pilot symbol in a special time slot are allocated, the DwPTS comprises the lengths of n OFDM symbols, n is a natural number and is more than or equal to 3; the P-SCH channel is mapped to a specified position; the specified position comprises the position of the third OFDM symbol, the time domain of which is the DwPTS; six sub-carriers, the frequency domain positions of which are among the system bandwidth, and then the downlink control signaling, the downlink data and the downlink pilot symbol are mapped to other time frequency resource positions except the P-SCH; and according to the allocated DwPTS and the set resource mapping position, the downlink data is transmitted. The invention also provides a device of downlink transmission. The method and the device of downlink transmission allocate the P-SCH channel in the time frequency resource position which does not interfere with the downlink control signal and a reference symbol, thus realizing the coexistence of the P-SCH channel, the control signal and the pilot symbol, and the realization is simple.
Description
Technical field
The present invention relates to mobile communication technology, be specifically related to a kind of method of downlink transmission and device.
Background technology
At present, 3-G (Generation Three mobile communication system) standardization body (3GPP) has started Long Term Evolution (LTE) research project of 3G wireless interface technology.According to progress, the LTE system determines to support 2 kinds of wireless frame structures:
A, first kind radio frames (hereinafter referred Type1), be applicable to Frequency Division Duplexing (FDD) (FrequencyDivision Duplex, FDD) system and time division duplex (Time Division Duplex, TDD) system, its structure as shown in Figure 1, wherein:
The frame length of Type1 is 10ms, is made up of 20 time slots, and every slot length is 0.5ms, is labeled as #0～#19 among Fig. 1.Per two continuous time slot are defined as a subframe, have 10 subframes, that is: subframe i is made up of time slot 2i and 2i+1, i=0,1,2 wherein ... 9.
When Type1 was applied to the FDD system, because the up-downgoing of frequency division duplex system separates on frequency domain, therefore every 10ms was in the time, and the provisional capital has 10 subframes to use up and down.
When Type1 was applied to the TDD system, every 10ms was in the time, and up-downgoing has 10 subframes and can use, and each subframe or be used for uply or is used for descendingly, and wherein subframe 0 and subframe 5 always are assigned as downlink transfer.
B, the second class radio frames (hereinafter referred Type2) are only applicable to the TDD system, its structure as shown in Figure 2, wherein:
The frame length of radio frames is 10ms, and every frame is divided into the field of 2 5ms.The field of each 5ms is divided into conventional time slot and 1 special time slot that length is 1ms that 8 length are 0.5ms, the special time slot of this 1ms by descending pilot frequency time slot (DwPTS), protection at interval (Guard Period, GP) and uplink pilot time slot (UpPTS) formation; Simultaneously, per two conventional time slots are composed of a subframe, and wherein subframe # 0 and descending pilot frequency time slot always are used for downlink transfer, and uplink pilot time slot always is used for uplink.
Described LTE system is based on OFDM (Orthogonal Frequency DivisionMultiplexing, OFDM) technology, its subcarrier spacing is set at 15 KHz, corresponding OFDM symbol lengths is 66.67us, because Type1, Type2 often a slot length are 0.5ms, therefore, when supporting little coverage, use the short Cyclic Prefix (CP) of length as 4.7us, every time slot comprises 7 OFDM symbols; And when supporting big the covering, using the long CP of length as 16.67us, every time slot comprises 6 OFDM symbols.
Fig. 3 shows under the frame structure of Type2, the time-frequency domain structural representation of descending sub frame (comprising two conventional time slots), the mapping position of frequency pilot sign on i antenna port of Ri among the figure (i=0,1,2,3) expression, C represents the mapping position of descending control signaling, D represents the mapping position of data-signal, wherein, scheduling control signaling of downlink takies preceding m OFDM symbol (m≤3 in the subframe at most, m is a natural number), its mapping position can be for removing each time-frequency domain resources position outside the frequency pilot sign mapping position.
When Cyclic Prefix (CP) is set to weak point CP configuration, comprise 14 OFDM symbols in the subframe, as shown in Figure 3, frequency pilot sign on the antenna port 0,1 takies the 1st, 5,8,12 OFDM symbol on time domain at this moment, frequency pilot sign on the antenna port 2,3 then takies the 2nd, 9 OFDM symbol, and the frequency domain interval between the frequency pilot sign on the frequency domain on the same antenna port is 6 subcarriers;
When CP is set to long CP configuration, comprise 12 OFDM symbols in the subframe, as shown in Figure 3, frequency pilot sign on the antenna port 0,1 takies the 1st, 4,7,10 OFDM symbol on time domain at this moment, frequency pilot sign on the antenna port 2,3 then takies the 2nd, 8 OFDM symbol, and the frequency domain interval between the frequency pilot sign on the frequency domain on the same antenna port is 6 subcarriers.
When descending primary synchronization channel (P-SCH) signal carries in the DwPTS of special time slot, the time-frequency domain position of regulation P-SCH channel as shown in Figure 4 in the present 3GPP standard, P-SCH takies first OFDM symbol of DwPTS on time domain, frequency domain position is 6 sub-carrier positions in the middle of the cell system bandwidth.
In order to improve the efficient of transfer of data, usually be used for transmitting downlink data with removing other resources outside the resource location that P-SCH takies in the DwPTS channel.In this case, because the P-SCH channel is arranged in first OFDM sign bit of DwPTS, and preceding 2 OFDM sign bits of conventional descending time slot need carry out the mapping of frequency pilot sign and descending control signaling, therefore the mapping position of described P-SCH channel may produce with the mapping position of frequency pilot sign and descending control signaling and conflict, thereby influences the mapping of control channel and the performance of transfer of data.
For addressing this problem, need be to carry out this mode of downlink data transmission in the DwPTS channel set of rule is set specially at network side, the processing complexity of the design complexities of system when communicating by letter will increase greatly, and stability also can correspondingly reduce.
By above-mentioned analysis as can be seen, when existing LTE TDD system carried out transfer of data in DwPTS, the P-SCH channel may produce conflicting of mapping position with control signaling and frequency pilot sign, thereby influences the mapping of control channel and the performance of transfer of data.
Summary of the invention
The embodiment of the invention provides a kind of method of downlink transmission and device, can make P-SCH channel and control signaling and frequency pilot sign be independent of each other, and reduces system complexity.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of method of downlink transmission, this method are applied to long-term advancing time division duplex LTE TDD system, and this method comprises:
Descending pilot frequency time slot DwPTS bearing downlink control signaling in the configuration special time slot, descending primary synchronization channel P-SCH channel, downlink data and descending pilot frequency symbol, described DwPTS comprises the length of n OFDM symbol, n is natural number and n 〉=3; Wherein, described special time slot is made of DwPTS, protection interval GP and uplink pilot time slot UpPTS;
To assigned address, described assigned address comprises: time-domain position is the 3rd the OFDM character position of DwPTS with described P-SCH channel Mapping; Frequency domain position is the 1.25MHz in the middle of the system bandwidth, and with on descending control signaling, downlink data and descending pilot frequency sign map other running time-frequency resource positions beyond the described P-SCH;
According to the DwPTS of described configuration and the resource mapping position of setting, carry out the transmission of downlink data.
A kind of device of downlink transmission, this device are applied to long-term advancing time division duplex LTE TDD system, and this device comprises: descending pilot frequency time slot DwPTS is provided with module, mapping block and downlink transfer module;
Described DwPTS is provided with module, the DwPTS bearing downlink control signaling in the configuration special time slot, descending primary synchronization channel P-SCH channel, downlink data and descending pilot frequency symbol, and described DwPTS comprises the length of n OFDM symbol, n is natural number and n 〉=3; Wherein, described special time slot is made of DwPTS, protection interval GP and uplink pilot time slot UpPTS;
Described mapping block, to assigned address, described assigned address comprises: time-domain position is the 3rd the OFDM character position of DwPTS with described P-SCH channel Mapping; Frequency domain position is the 1.25MHz in the middle of the system bandwidth, and with on descending control signaling, downlink data and descending pilot frequency sign map other running time-frequency resource positions beyond the described P-SCH;
Described downlink transfer module is provided with the setting of module and the resource mapping position that mapping block is set according to DwPTS, carries out the transmission of downlink data.
As seen from the above technical solutions, this method of downlink transmission and the device of the embodiment of the invention, be not less than the length of 3 OFDM sign bits by the minimum length of configuration DwPTS, simultaneously with the P-SCH channel configuration on the running time-frequency resource position that is independent of each other with descending control signaling and reference symbol, realized of the coexistence of P-SCH channel, and this method and apparatus is realized simple with control signaling and frequency pilot sign.
Description of drawings
Fig. 1 is the frame structure schematic diagram of Type1 in the prior art.
Fig. 2 is for being used for the schematic diagram of the frame structure of LTE TDD system in the prior art.
Fig. 3 is the schematic diagram of resource mapping position on the time-frequency domain of Type2 subframe in the prior art.
Fig. 4 is the schematic diagram that carries the P-SCH channel in the prior art in DwPTS.
Fig. 5 is the schematic flow sheet of method of downlink transmission in the embodiment of the invention.
Fig. 6 is the DwPTS structural representation of the first preferred embodiment A in the embodiment of the invention.
Fig. 7 is the DwPTS structural representation of the first preferred embodiment B in the embodiment of the invention.
Fig. 8 is the DwPTS structural representation of the first preferred embodiment C in the embodiment of the invention.
Fig. 9 is the DwPTS structural representation of second preferred embodiment in the embodiment of the invention.
Figure 10 is the schematic diagram of the composition structure of device of downlink transmission in the embodiment of the invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
The embodiment of the invention provides a kind of method of downlink transmission, its flow process as shown in Figure 5, comprising:
Step 501: DwPTS bearing downlink control signaling, P-SCH channel, downlink data and descending pilot frequency symbol in the configuration special time slot, described DwPTS comprises the length of n OFDM symbol, n is natural number and n 〉=3;
Step 502: the mapping position of configuration P-SCH channel, wherein time-domain position is the 3rd the OFDM character position of DwPTS, and frequency domain position is 6 subcarriers in the middle of the system bandwidth, and with on descending control signaling, downlink data and descending pilot frequency sign map other running time-frequency resources beyond the described P-SCH.
Step 503: according to the length of the OFDM symbol that comprises of DwPTS of configuration, and the running time-frequency resource mapping position of setting, carry out the transmission of downlink data.
In order to further specify process and the effect that the DwPTS that utilizes after disposing carries out downlink transfer,, described method of downlink transmission is given an example below by several specific embodiments:
Embodiment one
A, set the length of the length of the DwPTS in the LTE TDD system, establish this moment system bandwidth greater than the frequency domain bandwidth of P-SCH channel more than or equal to 3 OFDM symbols;
P-SCH was set shines upon, and P-SCH occupied the position of 6 subcarriers in centre of system bandwidth this moment, as shown in Figure 6 at the 3rd OFDM sign bit.Obviously, because described system bandwidth is greater than the bandwidth of P-SCH channel, therefore the frequency band of 6 subcarriers still can be used for control channel in the middle of removing in the 3rd OFDM sign bit, and the mapping position of frequency pilot sign and the 3rd OFDM sign bit are not overlapping, therefore the frequency domain position of 6 subcarriers promptly can be realized the coexistence of P-SCH channel and control signaling and frequency pilot sign in the middle of only need avoiding when the 3rd OFDM sign bit controlled the mapping of signaling this moment.
B, if control signaling only take first OFDM symbol, other configuration condition of system is identical with A, the P-SCH channel still is configured in the 3rd OFDM symbol for shining upon, as shown in Figure 7.Obviously, this moment, system controlled the mapping of signaling on first OFDM sign bit, in the 3rd OFDM position, only need promptly can realize the coexistence of P-SCH channel and control signaling and frequency pilot sign with data map to middle 6 subcarriers frequency domain position in addition.
C, other conditions are identical with A, unique difference is that the bandwidth of system's this moment is identical with the frequency bandwidth of P-SCH channel occupancy, be 6 subcarriers, then as shown in Figure 8, the 3rd OFDM sign bit needs all control signalings are shone upon at preceding two OFDM sign bits fully by the P-SCH channel occupancy this moment at this moment.
Embodiment two
The length of DwPTS is more than or equal to the length of 4 OFDM symbols in the supposing the system, and system bandwidth equals the frequency domain bandwidth that P-SCH occupies, and is 6 subcarriers, and the control signaling takies 3 OFDM symbols at most;
The P-SCH channel is set to be shone upon at the 3rd OFDM sign bit, because control channel takies 3 OFDM symbols at most, and the bandwidth of P-SCH channel is identical with system bandwidth, therefore as shown in Figure 9, the 3rd OFDM sign bit is used for the mapping of P-SCH channel fully, and the control signaling is shone upon on first and second and four OFDM sign bits.
As shown in the above description, the method of downlink transmission that the embodiment of the invention provides, be not less than the length of 3 OFDM sign bits by the minimum length of configuration DwPTS, simultaneously with the P-SCH channel configuration on the running time-frequency resource position that is independent of each other with descending control signaling and reference symbol, realized of the coexistence of P-SCH channel, and this method realizes simple with control signaling and frequency pilot sign.
The embodiment of the invention also provides a kind of device that carries out downlink data transmission, and it forms structure as shown in figure 10, comprising: DwPTS is provided with module 1010, mapping block 1020 and downlink transfer module 1030;
Described DwPTS is provided with module 1010, DwPTS bearing downlink control signaling, P-SCH channel, downlink data and descending pilot frequency symbol in the configuration special time slot, and described DwPTS comprises the length of n OFDM symbol at least, n is natural number and n 〉=3;
Described mapping block 1020, to assigned address, described assigned address comprises: time-domain position is the 3rd the OFDM character position of DwPTS with described P-SCH channel Mapping; Frequency domain position is 6 subcarriers in the middle of the system bandwidth, and with on descending control signaling, downlink data and descending pilot frequency sign map other running time-frequency resource positions beyond the described P-SCH;
Described downlink transfer module 1030 according to the DwPTS of described configuration and the resource mapping position of setting, is carried out the transmission of downlink data.
Described mapping block 1020 comprises: a P-SCH channel identifying unit 1021 and the first control signaling map unit 1022;
A described P-SCH channel identifying unit 1021 when the time-domain position of described P-SCH channel is the 3rd OFDM sign bit and system bandwidth during greater than P-SCH channel width, is notified the first control signaling map unit 1022;
Single 1022 yuan of the described first control signaling mapping according to the notice of a described P-SCH channel identifying unit 1021, is controlled the mapping of signaling at preceding 3 OFDM sign bits or the 1st OFDM sign bit, and is notified downlink transfer module 1030.
Described mapping block 1020 also comprises: the 2nd P-SCH channel identifying unit 1023 and the second control signaling map unit 1024;
Described the 2nd P-SCH channel identifying unit 1023 when the time-domain position of described P-SCH channel is the 3rd OFDM sign bit and system bandwidth when equaling P-SCH channel width, is notified the second control signaling map unit 1024;
The described second control signaling map unit 1024 according to the notice of described the 2nd P-SCH channel identifying unit 1023, is controlled the mapping of signaling at preceding 2 OFDM sign bits, and is notified downlink transfer module 1030.
Described mapping block 1020 further comprises DwPTS identifying unit 1025;
Described DwPTS judges single 1025 yuan, when the length of DwPTS during more than or equal to 4 OFDM symbols, notifies the described second control signaling map unit 1024;
At this moment, the described second control signaling map unit 1024 is used for controlling at the 4th OFDM sign bit the mapping of signaling, and notice downlink transfer module 1030.
The system of the downlink transfer that the embodiment of the invention provides, be not less than the length of 3 OFDM sign bits by the minimum length of configuration DwPTS, simultaneously with the P-SCH channel configuration on the running time-frequency resource position that is independent of each other with descending control signaling and reference symbol, realized of the coexistence of P-SCH channel, and this apparatus structure is simple with control signaling and frequency pilot sign.
Therefore; understand easily, the above is preferred embodiment of the present invention only, is not to be used to limit spirit of the present invention and protection range; equivalent variations that any those of ordinary skill in the art made or replacement all should be considered as being encompassed within protection scope of the present invention.
Claims (8)
1. a method of downlink transmission is characterized in that, this method is applied to long-term advancing time division duplex LTE TDD system, and this method comprises:
Descending pilot frequency time slot DwPTS bearing downlink control signaling in the configuration special time slot, descending primary synchronization channel P-SCH channel, downlink data and descending pilot frequency symbol, described DwPTS comprises the length of n OFDM symbol, n is natural number and n 〉=3; Wherein, described special time slot is made of DwPTS, protection interval GP and uplink pilot time slot UpPTS;
To assigned address, described assigned address comprises: time-domain position is the 3rd the OFDM character position of DwPTS with described P-SCH channel Mapping; Frequency domain position is the 1.25MHz in the middle of the system bandwidth, and with on descending control signaling, downlink data and descending pilot frequency sign map other running time-frequency resource positions beyond the described P-SCH;
According to the DwPTS of described configuration and the resource mapping position of setting, carry out the transmission of downlink data.
2. method according to claim 1 is characterized in that, when the time-domain position of described P-SCH channel is the 3rd OFDM sign bit and system bandwidth during greater than P-SCH channel width, carries out the mapping of descending control signaling at preceding 3 OFDM sign bits.
3. method according to claim 1 is characterized in that, when the time-domain position of described P-SCH channel is the 3rd OFDM sign bit and system bandwidth when equaling P-SCH channel width, carries out the mapping of descending control signaling at preceding 2 OFDM sign bits.
4. method according to claim 3, it is characterized in that, when the time-domain position of described P-SCH channel is that the 3rd OFDM sign bit and system bandwidth are when equaling P-SCH channel width, if the length of DwPTS is further carried out the mapping of descending control signaling at the 4th OFDM sign bit more than or equal to 4 OFDM symbols.
5. a device of downlink transmission is characterized in that, this device is applied to long-term advancing time division duplex LTE TDD system, and this device comprises: descending pilot frequency time slot DwPTS is provided with module, mapping block and downlink transfer module;
Described DwPTS is provided with module, the DwPTS bearing downlink control signaling in the configuration special time slot, descending primary synchronization channel P-SCH channel, downlink data and descending pilot frequency symbol, and described DwPTS comprises the length of n OFDM symbol, n is natural number and n 〉=3; Wherein, described special time slot is made of DwPTS, protection interval GP and uplink pilot time slot UpPTS;
Described mapping block, to assigned address, described assigned address comprises: time-domain position is the 3rd the OFDM character position of DwPTS with described P-SCH channel Mapping; Frequency domain position is the 1.25MHz in the middle of the system bandwidth, and with on descending control signaling, downlink data and descending pilot frequency sign map other running time-frequency resource positions beyond the described P-SCH;
Described downlink transfer module is provided with the setting of module and the resource mapping position that mapping block is set according to DwPTS, carries out the transmission of downlink data.
6. device according to claim 5 is characterized in that, described mapping block comprises: a P-SCH channel identifying unit and the first control signaling map unit;
A described P-SCH channel identifying unit when the time-domain position of described P-SCH channel is the 3rd OFDM sign bit and system bandwidth during greater than P-SCH channel width, is notified the first control signaling map unit;
The described first control signaling map unit according to the notice of a described P-SCH channel identifying unit, is carried out the mapping of descending control signaling at preceding 3 OFDM sign bits, and notice downlink transfer module.
7. device according to claim 5 is characterized in that, described mapping block comprises: the 2nd P-SCH channel identifying unit and the second control signaling map unit;
Described the 2nd P-SCH channel identifying unit when the time-domain position of described P-SCH channel is the 3rd OFDM sign bit and system bandwidth when equaling P-SCH channel width, is notified the second control signaling map unit;
The described second control signaling map unit according to the notice of described the 2nd P-SCH channel identifying unit, is carried out the mapping of descending control signaling at preceding 2 OFDM sign bits, and notice downlink transfer module.
8. device according to claim 7 is characterized in that described mapping block further comprises the DwPTS identifying unit;
Described DwPTS identifying unit is provided with the length of the DwPTS that module obtains being provided with according to described DwPTS, when the length of DwPTS during more than or equal to 4 OFDM symbols, notifies the described second control signaling map unit;
The described second control signaling map unit is carried out the mapping of descending control signaling at the 4th OFDM sign bit, and notice downlink transfer module.
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| CN2008100575747A CN101499963B (en) | 2008-02-03 | 2008-02-03 | Method and apparatus for downlink transmission |
| PCT/CN2009/070348 WO2009097821A1 (en) | 2008-02-03 | 2009-02-03 | Method and device for downlink transmission |
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| CN2008100575747A CN101499963B (en) | 2008-02-03 | 2008-02-03 | Method and apparatus for downlink transmission |
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| CN101499963B true CN101499963B (en) | 2011-07-20 |
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| WO2015123843A1 (en) * | 2014-02-20 | 2015-08-27 | 华为技术有限公司 | Resource scheduling method, data transmission method, and device |
| CN104936183B (en) | 2014-03-17 | 2020-06-16 | 中兴通讯股份有限公司 | Data transmission method and device |
| CN106559204B (en) * | 2015-09-29 | 2020-05-26 | 电信科学技术研究院 | Pilot frequency configuration method and device |
| WO2017190361A1 (en) | 2016-05-06 | 2017-11-09 | 华为技术有限公司 | Reference-signal transmission method and device |
| CN108418663A (en) * | 2017-02-10 | 2018-08-17 | 深圳市金立通信设备有限公司 | A kind of pilot frequency processing method and equipment |
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| CN101035371A (en) * | 2007-03-28 | 2007-09-12 | 中兴通讯股份有限公司 | Transmission method of synchronization signal of time-division duplex system |
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| CN101114877A (en) * | 2007-03-12 | 2008-01-30 | 中兴通讯股份有限公司 | Enhanced synchronous channel transmitting method |
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| US7675846B2 (en) * | 2006-06-23 | 2010-03-09 | Telefonaktiebolaget L M Ericsson (Publ) | Method and system for using the synchronization channel to obtain measurements in a cellular communications system |
| CN101222274B (en) * | 2008-01-25 | 2013-02-27 | 中兴通讯股份有限公司 | Synchronous signal transmission method and device in TDD system |
| CN101222273A (en) * | 2008-01-29 | 2008-07-16 | 中兴通讯股份有限公司 | Signal transmission method of physical control format indication channel in descending pilot frequency time slot |
| CN101227260B (en) * | 2008-01-30 | 2015-06-03 | 中兴通讯股份有限公司 | Method for sending physics combining retransmission indicating channel signal in downlink pilot frequency time slot |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101009513A (en) * | 2006-01-26 | 2007-08-01 | 上海原动力通信科技有限公司 | Cell synchronization method and initial cell searching method for broadband time-division dual-duplex cellular system |
| CN101114877A (en) * | 2007-03-12 | 2008-01-30 | 中兴通讯股份有限公司 | Enhanced synchronous channel transmitting method |
| CN101035371A (en) * | 2007-03-28 | 2007-09-12 | 中兴通讯股份有限公司 | Transmission method of synchronization signal of time-division duplex system |
| CN101102148A (en) * | 2007-08-08 | 2008-01-09 | 中兴通讯股份有限公司 | A method for transmitting downlink signals of time division duplex system |
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| CN101499963A (en) | 2009-08-05 |
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